Hi, Please correct me if I am wrong. This is my understanding: 1) genesys.conf defines the vendor id and , (usb address ?) 2) genesys_low.c is the low level implementation for the scanner with genesys_low.c being the header file for it 3) genesys.c is the high level implementation for the scanner with genesys.h being the header for it. Regards, Sanjay